.\"	$OpenBSD: log.9,v 1.9 2013/06/04 19:27:09 schwarze Exp $
.\"     $NetBSD: log.9,v 1.6 1999/08/17 05:24:06 enami Exp $
.\"
.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Michael Graff.
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.Dd $Mdocdate: June 4 2013 $
.Dt LOG 9
.Os
.Sh NAME
.Nm log ,
.Nm addlog
.Nd log a message from the kernel through the
.Pa /dev/klog
device
.Sh SYNOPSIS
.In sys/syslog.h
.Ft void
.Fo "log"
.Fa "int level"
.Fa "const char *format"
.Fa "..."
.Fc
.Ft void
.Fn addlog "const char *format" ...
.Sh DESCRIPTION
The
.Fn log
function allows the kernel to send formatted messages to user processes
listening on
.Pa /dev/klog .
Usually
.Xr syslogd 8
monitors
.Pa /dev/klog
for these messages and writes them to a log file.
.Pp
All messages are formatted using
.Xr printf 9 ,
logged using facility
.Dv LOG_KERN ,
and priority level
.Fa level .
.Pp
The
.Fn addlog
function is used to build a log message in steps, by adding information
to an initial call to
.Fn log .
.Sh SEE ALSO
.Xr syslog 3 ,
.Xr syslogd 8 ,
.Xr printf 9
